Weaving Calculations
A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.
A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.
 Reed Count
It is calculated in stock port system.No. of dents in 2 inches is called Reed Count.
Reed Count = EPI/(1 + Weft crimp %age)  Reed Width
Reed Width = Cloth Width *(100+ weft crimp %age)/100  Crimp Percentage
Crimp %age = {(Warp length – Cloth length)/Cloth Length}* 100
Crimp %age = {(Warp width – Cloth width)/Cloth width}* 100  Cloth Cover Factor
 Cloth Cover Factor = Wp.C.F +Wt.C.F. – {(Wp.C.F. – Wt.C.F)/28}
 Maximum EPI for particular count
 other design = (Ends /Repeat * 1/Yarn Diametre)/ (No of intersections/repeat+ ends/repeat)
 Warp Density
= <350 Weave Density = 50+{(Warp Density – 100) * F.D – 100} /{(Weft Density – 100)* F.D – 100}
 Effective Weave Density = W. D x K of loom width x K of Design
= < 72
Wp / filling – K  Loom Width – K  Weave Design – K 

Cotton = 1.00  140 cm – 0.99  Plain1/1 = 1.00 
Polyester/Cotton = 1.03  180 cm – 1.00  Twill 1/2 = 0.87 
Viscose Filament = 1.17  190 cm – 1.01  Matt, Gabardine 2/2 = 0.82 
Polyester Filament = 1.22  220 cm – 1.02  Drill 1/3 = 0.77 
250 cm – 1.08  Satin 1/4 = 0.69  
330 cm – 1.15  
360 cm – 1.20 
To change the count and the number of thread/inch, keeping the same denseness of fabric
To change the count without altering the denseness of the fabric
EPI in Exp.cloth = (EPI in exp.Cloth^{2}/EPI in given cloth) * count in given cloth
To change the EPI without altering the denseness of the fabric
Warp requirement to weave the cloth
 Warp weight in grams /metre = {(Total Ends * 1.0936 * 453.59 * crimp %)/(840 * count)} * wastage %
 Weft weight in grams /metre ={(R.S. in inches * 453.59 * PPI)/(840 * count)} * wastage % * crimp %
 Cloth length in metres with given weft weight=( weft weight in kgs * weft count * 1848 * 0.9144)/(PPI * R.S in inches)
For silk and Polyester
 Warp weight in grams /metre ={(Total Ends * count (Denier) )/9000} * wastage % * crimp %
 Weft weight in grams /metre = {(R.S in inches * count(Denier)* PPI)/9000}* wastage % * crimp %
Allowance for count in bleached and Dyed fabric
1.Count becomes 4%
2. FinerDyed counts become max 6% Coarser
Fabric Production Calculation
 Loom Speed = Motor RPM * (Motor Pully Diametre)/(Loom Pully Diametre)
 Loom Effeciency Percentage = (Actual Production/Calculated Production )* 100
 Moisture Regain Percentage = {(Yarn Weight – Dried Yarn Weight)/Dried Yarn weight} * 100
 Moistue Content Percentage = {(Yarn Weight – Dried Yarn Weight)/Yarn weight} * 100
Type of Yarn  Moisture Regain %  Moisture Content % 

Cotton  8.50  7.83 
Jute  13.75  12.10 
Silk  11.00  9.91 
Rayon, Viscose  11.00  9.91 
Wool  17.00  14.50 
Nylon  4.20  3.78 

 Warp Weight in Kg = (Total Ends * Tape Length in meters)/(1693.6 * Warp Count)
 Weft Weight in Kg = (R.S in centimetres * cloth length in metres * PPI )/(4301.14 * weft Count)
 Cloth weight in GSM = {EPI/Warp Cout)+(PPI/Weft count)}* 25.6
 oz (ounce ) per sq. yard = GSM(Grams per sq. meter)/34
 Material Measurement
To calculate the length of any rolled fabrics, this formula gives the nearest accuracy.
L = {0.0655(Dd)(D+d)}/t
Where L = Length of material (Feet) t = Thickness of fabrics (inches)
D = Outside diameter (inches) d = Inside diameter (inches)  The weight of yarn in a cloth
The weight of cloth manufactured on looms depends upon the weight of yarns in the warp and weft: ends/inch, picks/inch and the weight of size on the warp. Therefore,
Cloth weight = Weight of warp + Weight of weft + Weight of size (All inlbs.)
Whereas Weight of warp in lbs. = (Total No. of Ends * Tape Length in Yards)/(840 * warp yarn count)
Also
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I am from Bangladesh..
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Naseer
+923008228350
U give me solution of EPI and PPI
EPI = Ends Per Inch
PPI = Pick Per Inch
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R.S. stands for Reed Space
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ppi calculat ..
Example .
Pick : 66
Insertions : 2
Pick×2= 132
(ppi = 132)
What does R.S stands for?
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What should be the width of dip fabric meant for tyre manufacturing to be maintained so that after rubber coating EPI will not change
Regards
Sunil
How to calculate fabric weight per meter using 40 warp,60 weft, reed 58,pick 56,width 48 inches
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Hi,
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what is EPI & PPI
EPI stand for End pick per Inch while PPI stand for Pick Per Inch
Construction: 30×20+70D/…….×60=61″
GSM=139
EPI=????
EPI – Ends per Inch
PPI – pucks per Inch
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